Sex

For some animals, romance goes more smoothly when it comes with gifts.

When It Comes to Romantic Gift-Giving, Humans Aren’t Alone. Snails, Birds and Flies All Woo Each Other With Presents

Throughout the animal kingdom, sweethearts bestow offerings with their amorous advances

Earthwork Portrait of Genghis Khan

Move Over, Genghis Khan. Many Other Men Left Huge Genetic Legacies

A 2015 study showed that ten other men have a lot of descendants. The paper is just one of several genetic studies revealing the secrets of descent

Bufoceratias wedli, a deep-sea anglerfish

Bizarre Sex Helped Anglerfish Diversify and Dominate the Deep Sea, Study Suggests

Some of these fish perform obligate parasitism, in which males attach to—and then fuse bodies with—the much-larger females

Beachcombers stumbled upon the fish south of Cannon Beach, a small coastal town in northwest Oregon.

Beachcombers Discover Rare, Deep-Sea Anglerfish Washed Up on Oregon Coast

Most humans will never see a Pacific footballfish, as the creatures live at depths of 2,000 to 3,300 feet below the ocean's surface

Julianne Moore as Mary Villiers and Nicholas Galitzine as her son George Villiers in "Mary & George"

The Real Story Behind 'Mary & George'

The new mini-series dramatizes the Villiers family’s scandalous rise to power at the court of England's James I

Heterodoxy's illustrious members included (clockwise from top right) Marie Jenney Howe, Susan Glaspell, Crystal Eastman, Rose Pastor Stokes, Doris Stevens, Charlotte Perkins Gilman and Rheta Childe Dorr.

The All-Woman Secret Society That Paved the Way for Modern Feminism

Based in Greenwich Village, Heterodoxy had just one requirement for membership: An applicant must "not be orthodox in her opinion"

The otherworldly form of the octopus has inspired millennia of fear and awe from humans.

Ten Wild Facts About Octopuses: They Have Three Hearts, Big Brains and Blue Blood

These bizarre creatures have been around for hundreds of millions of years, and for humans, they’ve inspired horror, admiration and culinary prestige

Maui-based photographers Lyle Krannichfeld and Brandi Romano spent about 30 minutes observing and photographing two male humpback whales on January 19, 2022.

These Photos Are the First to Show Humpback Whales Mating—and Both Are Males

Photographers spotted the interaction in the Pacific Ocean off the coast of Maui in 2022

Charlotte, a round stingray, was determined to be pregnant, despite not having a male ray companion for at least eight years.

A Female Stingray That Hasn't Had a Mate in Eight Years Is Mysteriously Pregnant. Is a Shark the Father?

Though the round stingray, named Charlotte, shares her aquarium tank with two male sharks, experts say it is impossible for a shark to impregnate a ray

The 23 pairs of human chromosomes. People who inherit two tall X chromosomes (bottom right) are much more susceptible to autoimmune diseases than people with one X and one short Y chromosome.

Why Do Women Get More Autoimmune Diseases? Study of Mice Hints at Answers

Four in five people with an autoimmune disease are women. New research points to an RNA molecule involved in silencing one of their X chromosomes as a potential culprit

An image from an electron microscope of Treponema pallidum, the bacteria that causes syphilis. In 2022, the number of reported cases of syphilis in the United States was the highest it has been since 1950.

Syphilis Cases in the U.S. Are the Highest Since 1950

Diagnoses of the sexually transmitted infection rose by nearly 80 percent between 2018 and 2022, according to a new report from the CDC

A bilaterally gynandromorphic green honeycreeper near Manizales, Colombia. 

This 'Extremely Rare' Bird Is Half Female, Half Male

The green honeycreeper is only the second of its species ever observed with this condition—and the first recorded in more than 100 years

The premier lady of sex work in Victorian St. Louis built an empire estimated to be worth at least $100,000—the equivalent of about $3.7 million today.

The Formerly Enslaved Black Bordello Queen Who Built a Notorious Business Empire

In 19th-century St. Louis, Madam Priscilla Henry earned a life-changing fortune—and scores of enemies vying for her crown

When erect, the penises of male serotine bats are seven times longer than female bats' vaginas and seven times wider than the females' vaginal openings.

This Bat Uses Its Extra Long Penis Like an Arm While Mating

Serotine bats are the first mammals known to mate without penetration, new research suggests

Researchers think that this pendant could be the oldest known depiction of a penis—and early evidence of humans' ability to think symbolically.

Is This the Earliest Known Phallic Art?

Researchers think the 42,000-year-old artifact was carved from graphite to resemble a penis

On May 25, 1977, a fire at the Everard Baths in New York City killed 9 people and injured 12 more.

Before It Burned Down, This Bathhouse Served as a Haven for New York City's Gay Community

For decades, gay men gathered anonymously at the Everard Baths, seeking sexual liaisons and camaraderie alike

An illustration of Anthony Comstock, published in Puck magazine in 1906

The 150-Year-Old Comstock Act Could Transform the Abortion Debate

Once considered a relic of moral panics past, the 1873 law criminalized sending "obscene, lewd or lascivious" materials through the mail

Masturbation may help reduce STIs and increase fertilization in male primates.

Male Primate Masturbation May Have Evolved to Prevent STIs

The behavior originated some 40 million years ago to improve breeding success and protect against pathogens, according to a new study

A Babylonian clay model dated to 1800 B.C.E. shows a nude couple on a couch engaged in sex and kissing.

Humanity’s First Recorded Kiss Was Earlier Than We Thought

Ancient texts suggest romantic smooching, and likely the diseases it transmitted, were widespread in Mesopotamia

Mammoth and elephant tusks are elongated incisors, so they're made of the same materials as other teeth.

Male Woolly Mammoths Had Testosterone-Fueled Aggressive Episodes

By studying preserved tusks, scientists suggest the mammals experienced a yearly condition known as musth, like male elephants do today

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